Circle brace



W. H. BURSTALL.

CIRCLE BRACE.

APPLICATHIN FILED LAN. 12. 1920.

2 SHEETS-SHEET l.

Patented June 13, 1922.

W. H. BURSTALL.

CIRCLE BRACE.

' APPLICATION FILED IAN-12. 192D. 1,4 1 9,5%1 Pat entw June 1?, 1922. 2SHEETS-SHEET 2- r unum m UNETED STATE @FFEQE.

WILLIAM H. BURSTALL, OF OXNABD, CALIFORNIA, ASSIGNOB 035 ONE-HALF T0WALTER, ADAMSON, O35 OXNARD, CALIFORNIA.

CIRCLE BRACE.

Application filed January 12, 1920.

To all whom 2'! may concern:

Be it known that I. \Vinhrai'r H. BUR- SJALL. a citizen of the UnitedStates, residing at Oxnard, in the county of Ventura and State ofCalifornia. have invented a new and useful Circle Brace, of which thefollowing is a specification. 1

My invention relates to a circle brace, which is the name given in theart. to an article used as a brace between the circular rack and thetool joint in a Barrett oil well jack.

An object of my invention is to provide a circle brace of the characterreferred to which will be readily adj ustable, and which willincorporz'ite a new and improved mode of adjustment.

A further object of my invention is to provide an adjustable circlebrace. which will be sturdy and reliable in action, and simple andeconomical of manufacture.

Another object of my invention is to provide a circle brace with animproved device for application to a tool joint.

Other objects and advantages will appear in the subjoined detaileddescription.

Referring to the drawings:

F igure 1 is a perspective view illustrating my circle brace inoperative position between a circular rack and tool joint in a Barretoil well jack.

Fig. 2 is a longitudinal view'partly in section of a preferred term ofmy invention.

Fig. 3 is a longitudinal. view of the samelooking from the right ofFig". 2.

Fig. 4 is a detail section of the means utilized for maintaininethe samein adjusted position.

Fig. 5 is an end view of the same.

F ig. 6 is a section on a line indicated by a' cf in Fig. 4:.

Fig. 7 is a section taken on a line indicated by 02 -40 in Fig. 4.

Fig". 8 is a longitudinal View of a section of the device illustrated inFig". 2 with the hand wheel, serrated dog. and locking ring; removed.

Fig. 9 is a perspective view of the locking ring employed, in thepreferred form of my invention illustrated in F ig. 2.

Fig. 10 is a perspective view of the hand wheel employed in the same.

Fig. 11 is a perspective View of the serrated dog employed in the same.

Specification of Letters Patent.

Patent-ed June 13, 1922'.

Serial No. 350,761.

Referring to the drawings there is illustrated in Figure l a Barrett oilwell jack. This device utilizes a circular steel rack indicated at 2,which rack is in practice secured to a derrick floor as indicated inFig. ure 1. A wrench post is fixed at one end of the rack 2 and atraveling jack 4 is carried upon said rack 2.

The Barrett oil well jack is employed to set up or unscrew tool joints.As indicated in Fig. l a tool joint 5 is gripped by a pair of right andleft wrenches 6 applied to opposite members of the joint. One of saidwrenches 6 is fixed. abutting the stationary wrench post 3. The other ofsaid wrenches 6 abuts the traveling j acl; 4:. Upon a movement of thejack 4 the wrenches (3 will set up or unscrew the joint 5.

It requires considerable power to set up or unscrew tool joints of thesize for which is employed a Barrett oil well jack. In practice thesetting up or unscrewing of the same produces a very considerable strainupon the wrenches 6 and upon the circular track 2. Considerablediiliculty has been experienced by users of such type of jack because ofthe buckling ot the rack 2 produced by the strain being; applied to therack at divergent points thereof.

lily invention pertains to a device utilized to brace or translate aportion of said strain between the tool joint 5 and a point intermediate the wrench post 3 and the jack 4. This device comprises abrace T which engages at one end with the tool, joint 5 and at theopposite end with the inner periphery of the rack 2. Such a brace willeliminate any buckling ot the rack 2 by providing a direct reinforcementbetween the tool joints 5 and the rack 2 intermediate the wrench post 8and jack 4.

Referring particularly to Figures f2-ll ot the accompanying drawings thepreferred form of my invention includes a barrel 8 which may be readilyformed ot'a piece of heavy pipe. A plunger 9 is telescopicallyadjustable within the barrel 8. The plunger 9 is provided with alongitudinally extending series of serrations 10.

The barrel 8 is preferably enlarged at its plunger receiving; end and isformed with an annular flange 11. Adjacent the flange 11 the barrel 8 isapertured as at 12 to receive a dog: 13 which dog 13 is provided withserrations 1d adapted to interfit with the serrations 10 of the plungerThe barrel 8 is threaded as at 15 adjacent the aperture 12 opposite theflange 11. The barrel 8 provides an annular seat 16 between the flange11 and thread 15 upon which is rotatively mounted a ring like member 17.The ring like member 17 is provided on its inner periphery with a camsurface 18. looking ring 19 is threaded upon the thread 15 to confinethe ring longitudinally relative to the barrel. 8. The barrel 8 isapertured to receive a pin 20 which is received within a longitudinalslot 21 formed in the plunger 9.

The end to engage within. a slot periphery of the rack well jack.

A slipholder 23 is swiveled upon the end 24 of the barrel. A pair ofspaced slips 25 is rotatively mounted within the slipholder 23transverse to the axis of the barrel 8.

The operation of the form of my invention last described is as follows:The brace is positioned with the flattened end 22 of the plunger 9abutting the inner periphery of the rack 2 of a Barrett oil well. jackand the slips 25 engage one member of a tool joint 5. The brace is sopositioned by means olf telescopically adjusting the plunger 9 withinthe barrel 8, which adjustment is accomplished by rotating thehandwheel. 17 until the cam surface 18 releases the dog 13, whereupon theplunger 9 is longitudinally movable relative to the barrel 8. When thedesired adjustment of the plunger 9 and barrel 8 has been attained thehand wheel 17 is rotated or moved transversely of the barrel 8 until thecam surface 18 secures the serrations ll of the dog 13 in engagementwith the serrations 10 of the plunger 9, in which position the relativeadjustment of the plunger 9 and barrel 8 will be maintained.

The slips 25 being spaced and serrated. will engage with tool joints ofvarying diameters, and said slips being rotatively mounted within theslip holder 23 the brace 22 of the plunger 9 is flattened formed on theinner 2 of a Barrett oil 7 may be applied to the moving member of a tooljoint.

My invention is not limited to any particular form or details ofconstruction for in addition to the form above described there are anumber of other forms of my invention, and my invention is of the fullscope and breadth set forth in the following claims.

I claim:

1. A circle brace comprising telescopically adjustable sections, one ofsaid sections having a longitudinally extending series of serrations,and means engaging said serrations to maintain said sect-ions inadjusted relation, said means including a member movable in an arerelative to the longitudinal axes of said sections.

2. A circle brace comprising a barrel, a plunger telescopicallyadjustable within said barrel, said plunger having a longitudinallyextending series of serrations, a dog carried by said barrel, said doghaving serrations adapted to engage with said plunger serrations tomaintain said barrel and plunger in adjusted relation, and means tosecure said dog in engaging position.

3. A. circle brace comprising a barrel, a plunger telescopicallyadjustable within said barrel, said plunger having a longitudinallyextending series of: serrations, a dog carried by said barrel havingserrations adapted to engage said plunger serrations to maintain saidbarrel and plunger in adjusted relation, and a member carried by andsurrounding said barrel, said member being provided with a cam surfaceto secure said dog in engaging position.

41-. In combination with a circle brace, a slip holder swiveled upon oneend of said circle brace, and a pair of serrated slips supported by saidholder.

Signed at Oxnard, California, this 5th day of January, 1920.

TVILL'IAM H. BURSTALL.

Witnesses TV. MARK Donner, HELEN Error,

